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Effect of dip coating parameters on microstructure and thickness of 8YSZ electrolyte coated on NiO-YSZ by sol-gel process for SOFCs applications.

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Title: Effect of dip coating parameters on microstructure and thickness of 8YSZ electrolyte coated on NiO-YSZ by sol-gel process for SOFCs applications.
Authors: Niazmand, Morteza1 (AUTHOR) m.niazmand@merc.ac.ir, Maghsoudipour, Amir1 (AUTHOR), Alizadeh, Masoud1 (AUTHOR), Khakpour, Zahra1 (AUTHOR), Kariminejad, Arash2 (AUTHOR)
Source: Ceramics International. Jun2022, Vol. 48 Issue 11, p16091-16098. 8p.
Subjects: Sol-gel processes, Solid oxide fuel cells, Yttria stabilized zirconium oxide, Field emission electron microscopy, Coating processes, Infrared radiation, Surface coatings
Abstract: 8 mol % Yttria stabilized zirconia (8YSZ) coatings are widely used as electrolytes in solid oxide fuel cells (SOFCs). In this study, sol-gel process was used in order to in-situ synthesis of 8YSZ electrolyte layer on NiO-8YSZ substrate applying dip coating method. Solid content, viscosity and withdrawal speed were investigated as effective parameters that affect quality and thickness of coatings. Fourier transform infrared radiation (FTIR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analyses were used to evaluate the microstructure of 8YSZ film. A dense and uniform coating was obtained with increasing solid content. Reduced viscosity also yielded a better uniformity and formed crack free coatings. Thickness of coatings was controlled by withdrawal speed. Results reveal that a dense and uniform coating was obtained with molar ratio of 1 − Propanol Zr = 10 using sol only 5min after preparation. Minimum thickness was measured 10 μm at withdrawal speed of 1 cm/min. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:8 mol % Yttria stabilized zirconia (8YSZ) coatings are widely used as electrolytes in solid oxide fuel cells (SOFCs). In this study, sol-gel process was used in order to in-situ synthesis of 8YSZ electrolyte layer on NiO-8YSZ substrate applying dip coating method. Solid content, viscosity and withdrawal speed were investigated as effective parameters that affect quality and thickness of coatings. Fourier transform infrared radiation (FTIR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analyses were used to evaluate the microstructure of 8YSZ film. A dense and uniform coating was obtained with increasing solid content. Reduced viscosity also yielded a better uniformity and formed crack free coatings. Thickness of coatings was controlled by withdrawal speed. Results reveal that a dense and uniform coating was obtained with molar ratio of 1 − Propanol Zr = 10 using sol only 5min after preparation. Minimum thickness was measured 10 μm at withdrawal speed of 1 cm/min. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2022.02.155